Abstract

Chemometrics of NIR spectra of aqueous salt solutions M(ClO₄)_n, where Mⁿ⁺: Li⁺, Na⁺, Mg²⁺, Ca²⁺, Sr²⁺, Ba²⁺, Zn²⁺, Cd²⁺, Al³⁺, Ga³⁺, In³⁺, Sc³⁺, Y³⁺, La³⁺ were used to establish the effect of the cation nature on the structure of aqueous electrolytes solutions. Principal component analysis showed that near infrared (NIR) spectra of the systems under study are grouped into clusters. It was found that the values of the eutectic concentrations of aqueous salt solutions and the polarising powers of cations correlate. The combined use of NIR spectroscopy, chemometrics of the spectral data and a generalised phenomenological model of the structure of aqueous electrolytes solutions is a new approach to studying of the structure of concentrated solutions.

© 2014 IM Publications LLP

Temperature measurements of turbid aqueous solutions using near-infrared spectroscopy

Naoto Kakuta, Hidenobu Arimoto, Hideyuki Momoki, Fuguo Li, and Yukio Yamada
Appl. Opt. 47(13) 2227-2233 (2008)

Identification and quantification of 16 inorganic ions in water by Gaussian curve fitting of near-infrared difference absorbance spectra

Gerrit W. Steen, Elmar C. Fuchs, Adam D. Wexler, and Herman L. Offerhaus
Appl. Opt. 54(19) 5937-5942 (2015)

Role of temperature in de-mixing absorbance spectra composed of compound electrolyte solutions

G. W. Steen, A. D. Wexler, E. C. Fuchs, H. A. Bakker, P. D. Nguyen, and H. L. Offerhaus
Appl. Opt. 57(27) 7871-7877 (2018)

Comparative study of multiple thiol-based self-assembled monolayer coatings for the SERS detection of nitrite, nitrate, and perchlorate anions in water

P. Muñoz, C. T. N. Noordam, R. J. M. Egberink, J. Huskens, and S. M. Garcia-Blanco
Appl. Opt. 58(34) 9345-9352 (2019)

Infrared Spectroscopy of Biologic Materials in Aqueous Solutions

E. R. Blout and H. Lenormant
J. Opt. Soc. Am. 43(11) 1093-1095 (1953)